Turbocache memory allocation in 32bit XP

Nvidia has video cards (NVS285 PCI-e) ) that use "turbocache" part of system memory to bring the memory of the card from 64MB to 128MB. In a 4 GB 32 bit XP system we know that the OS does not see all of the 4GB. Is the turbocache taken out of the memory that the OS can 'see' or out of the part that it can not see? I am using 4 such cards in a 2 GB system so 256MB (4*64MB) is at stake here. What could I expect by going to 4GB?

I trade in the financial markets and the 8 screens give me realtime charting data.

Here is my Task Manager performance info

Handles-18254
Threads - 605
Processes - 47

Physical Memory -
Total - 1440788 ( 2*2GB sticks)
Available - 101200 average
System Cache - 268436

Kernal Memory -
Total - 208288
Paged - 176840
Nonpaged - 31448

That is not much of an answer dj... and the first question was the main one I needed to know?

It wont make much difference for what you are using it for, plus I bumped your thread for you.